44 A^DRENHLE. 



Melitta tibialis, Kirby, lib. tit. 107 $ . 

 Andrena tibialis, Smith, Zool. v. 1737. 



Nyland. Notts, ur S'dllsk. pro Faun, et Mo. Fenn. it. 98. 



Thorns. Opusc. Ent. 144 ; Hym. Scand. ii. 77. 



Female. Length 6-7 5 lines. — Black ; the clypeus and cheeks clothed 

 with cinereous pubescence ; at and above the insertion of the an- 

 tennas it is slightly fulvous. Thorax clothed above with rufo- 

 fulvous pubescence, at the sides and beneath it is griseous ; the 

 tegulae rufo-piceous, the wings subhyaline, having frequently a 

 fulvous tinge ; their apical margins faintly clouded ; the fringe on 

 the femora and the floccus white ; the posterior tibiae and the 

 tarsi rufo-fulvous, the scopa bright fulvous. Abdomen subovate, 

 the apical margins of the segments depressed, shining, covered with 

 a short griseous pubescence, and having a fringe of the same 

 colour on the apical margins of the segments ; the apical fimbria 

 fuscous ; beneath, the margins are ciliated with white. B.M. 



Male. Length 5-6| lines. — Black ; the face clothed with black or 

 dark brown pubescence, the cheeks have a long beard of pale ful- 

 vous pubescence ; the antennas nearly as long as the thorax, the 

 joints of the nagellum subarcuate, the thorax has a rufo-fulvous 

 pubescence ; the wings as in the other sex ; the tarsi and the apex 

 of the posterior tibiae rufo-testaceous. Abdomen ovate-lanceolate, 

 shining, and thinly sprinkled with pale fulvous pubescence, the 

 segments having a thin fringe of the same colour; the apex 

 fulvous. B.M. 



Yar. a. The posterior tibiae rufous half their length, sometimes 

 almost entirely rufous. 



This species usually appears early in April, but is not unfrequently 

 found in March ; it is generally distributed throughout the United 

 Kingdom. In the neighbourhood of London it is very frequently 

 infested by a species of Stylops. On the 5th and 6th of April, 1875, 

 no less than forty-six bees were captured that were stylopized ; of 

 these only one female bee developed a male Stylops, eighteen males 

 being obtained from male bees; five female bees had each two 

 females of the parasite infesting them ; and two males each pro- 

 duced two males of the Stylops ; all the rest had single parasites 

 in them. It is from the early developed species of Andrenidae that 

 Stylops is to be obtained ; those species that appear in June or July 

 are rarely if ever infested. 



23. Andrena mouffetella. 



A. nigra, pallido pubescens ; abdomine piloso, nigro-aeneo ; thorace 

 rufescenti-piloso ; tibiis posticis tarsisque runs. 



Andrena mouffetella, Smith, Zool. v. 1738 ; Bees Great Brit. 71. 

 Melitta mouffetella, Kirby, Mon. Apum Angl. ii. 108. 



Female. Length 5^-6 lines. — Black ; the face below the antennae 

 with pubescence of a changeable hue, fuscous in one light and 



